Stoker tuyere construction



Dec. l5, 1931. c. H. RlcH STOKER TUYERE CONSTRUCTION Filed July 25. 1927INVENTOR CARL A( HMH BY @MQW ATTOR Y WITNESSES @,fmb

e 1+. @zu-mv Patented Dec. 15, 1931 cent n. nien, or WORCESTER,MASSACHUSETTS, assionon Toni-LEY STonnn conronaTron, or Woncnsrnn,MASSACHUSETTS, a conronaTion" rin-MASSACHUSETTS meenemen cementeriosApplicatie?. ruea July a5,

My invention relates to stokers and more particularly to high side walltu'yresoi' the type shown in the U. S. patent to Blackburn #ricerca erJan. 24, 1922., l

The high side wallV tuyere of the type shown in the Blackburn patent isa looX-like structure mounted to rest on the Astationary side Wall of aretort and to lean against and be fastened to the brick side wall of thefurnace. Such a construction is not adaptable to a stoker of theRileytype in which the tuyeres are reciprocated longitudinally oiff theretort. lt is, accordingly, one 'object of this invention to provide, ahigh side wall tuyere construction which may he mounted on thereciprocable side hars of a stoker.

lt is desirable to utilize a narrow pla-te type oi tuyere which may beeasily manufactured and quickly assembled in the stoker, and it is aiur-ther object of this invention to provide a Stoker construction inwhich a series of plates may he lutilized for the high side wall tuyeresand which will serve efficiently through a long life of usefulness.

lf a Vconsiderable number of such narrow plates are utilized to form theside wall of the Stoker', due allowancemust be made for expansion andgrowth of the tuyre plates during the heating and normal usage thereof.lThe side bars of a Stoker ordinarily slope towards they rearand'ifplates are mounted loosely on such sidevbars and are of i such asize asto permitthenecessary eXpansion and growth, then these plateswill slide towards the lower end of the stoker and leave a large air gapat the upperfendwhich wlll interfere with the zehcientfoperation of `theStoker. lt is, accordingly, al further ob]ect of the inventiontoprovidea construction which will locate thev tuyre plates in such amanner that each will be given the proper mount of space within which toexpand and grow and there will loe no large air gap throughout theextent ot the Stoker Wall;

A further object is to provide a plate type of tuyre which will have along life and particularly to provide one in which the outer portion of`the tuyre may burn' away and yet i927. Senn No. 208,250.

air leakage to any detrimental 'eXtent will be obviated l lf a platetype of tuyere is utilizedv and particularly if it is mounted on areciprocating side bar, there is a considerableproblem involved in sofastening these plates to their support Athat they Ymay loe-easilyreplaced when they burn out.

l Further objects of this invention are accordingly to provide a verysimple manner of fastening the tiiyeie plates in position so that it ispossible toV remove any plate throughout the entire extent-oit' the walland to replace it without removing other plates or moving them into adifferent position and, f

FigfQ'is an enlarged section on the line 2 2 of Fig. l;

Fig.- 3 is av perspective View of a group o 'tuyre plates mounted inposition, part being omitted to show the manner of fastening them totheir' support;

Y Fig;r Llis aipe'rspective viewV ,oi aV single 'tuyre plate;" v Y Fig.5 is an enlarged plan view Vor the corii rugated lisupprting plate.; and

voithe rear supporting wall which carrie's'tlie Atuyre plates; i Y

ln accordance with thi vide a tuyere structurewhicli is, particularlyuseful for high side wal-ls,*although it may be utilized inotheifpositions in the place of the ordinary tuyeres'. This comprises apermanently located supporting portion and a series of removable platesarranged thereon in such a manner as to provide a side wall for the fuelbed and feed air thereto. The supporting portionrof the tuyere serves asa Vrear wall to the air feeding passage and is preferably s invention Ipro-` Fig is a perspectiveV view' of one section mounted on the side barof the stolrer, which may be either stationary or reciprocable, and theremovable tuyre plates forming the front wall of the air passage arepreferably so constructed that they will hool over a portion of the rearwall and interlock therewith in such a manner that each plate will belocated in its proper position and yet be permitted to grow and expandduring usage. ln order to fasten these removable plates, as well as therear supporting structure, to the side bar of the furnace provide aconstruction which removably bolts the parts to the side bar and at thesame time holds the removable plates rigidly and rmly on the rearsupporting tuyere wall.

Referring more particularly to the drawings, I have there shown aportion of a side bar 10 of a stoker of the Riley type which is adaptedto reciprocate lengthwise of the retort. As will beV understood byreference to prior patents in this art, of which the patent to Riley#1,322,822 may be cited as an example, two side bars co-operating with abottom form a fuel retort and the tuy`ere blocks are mounted on the topsof the side bars and so arranged that they may reciprocate therewith.rllhe side bars are spaced apart to admit air to the tuyre blockssupported thereby. At t ie sides of the furnace a single reciprocablebar 10 is located between the stationary retort bottom 11 and thefurnace wall 13 which may be of suitable construction. ln the particularembodiment illustrated the refractory wall 13 is supported on an angleplate 14, and attached to this is a wall plate 15 of metal which forms asurface against which the reciprocable side bar may slide.

In the forni illustrated in the drawings, the tuyere structure comprisesa hollow construcion made up primarily of two parts, one a support 16intended to remain permanently in the stolzer and the other a set ofremovable tuyere plates carried by the support which `may be replaced asthey burn out. As shown,

the support comprises a wall 18 which has a smooth rear surface adaptedto slide against the front face of 1clade 15. For the salte ofconvenience in assembling these parts in the furnace, this support maybemade up in several sections and each section is adapted to carry anumber of removable tuyere plates thereon. The support is so'constructedthat it Will rest on the top edge of the side bar 10,

.and for this purpose it is made in the shape of an angle iron having abottom 19 provided with a groove 2O which interiits wita a projectingrib 21 on the side bar 10, thereby locating the back plate 18 andpreventing it sliding into the retort. The side bar 10 is provided witha set of spaced ribs 23 which project rearwardly and support on theirtop edges the bottom 19 of the support 16. rllhe' floor plate 19 has anopening 24 therethrough extending substantially the length of eachsection so that air may be admitted in large quantities to the tuyeres.Strengthening ribs 25 and :26 are provided to connect the wall 18 withthe base 19.

Removably mounted on the support 16 are a series of narrow tuyere plates30 which are so constructed and arranged as to form an air passagebetween the wall 18 and their fuel supporting outer faces, foradmitting' air to the fuel bod. Tuyere openings may be provided in thebody of each plate but they are preferably formed by grooves 31 in theedges of the plates as illustrated. The plate 30 is so constructed thatit will absorb heat readily and conduct it to the cooling air streampassing beneath and tnerethrough. For this purpose the plate ispreferably so constructed as to have a narrow supporting web 32 and aflange 33 against w iich the fuel body in the retort rests. The llangesin the presentembodiment project even distances on opposite sides of thecentral web portion, but obviously they may project entirely on one sideand be l.-shaped instead of "i--shaped as illustrated.

ln the embodiment illustrated the tuyre members are made in twosections; the plate 30 and a lower removable corrugated plate 35,although it will be understood that the removable tuyere sections may bemade up in single members extending from the floor 19 to the top of thewall 18. These corrugated or ribbed plates 35 preferably entend thelength of the supporting section 16 and have the further purpose ofmaking it possible to change the air distribution throughout the lengthof the stolrer easily without changing the construction of the remainingparts. they burn out. 'l he spaces between the r ,s of these plates formfurther tuyere openings. The upper and lower air openings are staggered,as shown in Fig. 3, so as to cause more even air distribution and toprovide a more uniform thickness of metal in the casting. Thecorrugations on the plates are preferably arranged at an angle, asillustrated in Fig. 5 so that coal siftings will not readily get intothe openings, the angle being so arranged relative to the normal motionof travel of the fuel t at siftings will tend to move down out yof thecorrugations rather than up them. These rib1 plates preferably made witha cen l web 36 carrying on its upper and lower surfaces two rows ofvertically entending ribs 37 and 38, thereby' giving an extensivesurface for air cooling these parts. These ribs correspond with parts ofthe vertical tuyere plates to described which nialre it possible for theouter portion of the tuyere mem to burn away and there still be asecondary member adapted to support the fuel and prevent eX- tensive airleakage. rlhat is, the outer row rlhese may be easily replaced when lil@of corrugations 37 supports the fuel initially and transmits airthereto, andthe ribs 38 stand as a reserve which will provide tuyres incase the wholeouter part of the bar-burns away. These plates are mountedon the bottom 19 of the backing by providing the side walls 26 of thebacking with inwardly projecting lugs 39 which iit into notches 40 onthe ribbed bars 35.

The vertical tuyere plates. 30 are constructed similarly Vin that theyhave two sets of flangesadapted to support the'fuel and supply airthereto. The innerant'ge 42 is a rib spaced some distance from thevouter flange 33 and is substantially parallel and coeXtensivetherewith, this rib having notches 43 corresponding with the tuyereopenings 31 so as to transmit the air within the air passage to theouter face of the tuyre.v The upper end 45 of the plate 30 is a massivethick section of iron which will withstand considerable burning'beforeits utility is impaired.

"One of the primary features of my invention has to dopwith the mannerof fastening the tuyre plates and backing to their support so that anyindividual tuyo-re plate may be removed without interfering with. theothers. To this end, I provide means which serves to bolt down `a groupof these tuyre plates to the side bars andwhich indirectly fasten thesupport to the side bar as well, although it will be understoodA thatthese parts may be bolted separately and independently to the side bar.I-Iowever, as illustrated, a single bolting device serves to fasten themboth in place. In order that the tuyre plates may be located in properpositions to permit expansion and growth and to prevent the plates fromsliding down to the rear of the stoker, I provide the plate 18 withupstanding lugs 48 which are'so spaced that the webs 32 of the removabletuyere plates will lit therebetween. The lugs 48 project toward theretort as well as upwardly from the plate 13 so that they are spacedfrom the plate 15 of the furnace wall. `rIhe referred manner offastening` down the tuyere plates is to hook their tops over theseupstand.- ing lugs '48 and to bolt themdown so they cannot be liftedfrom -ithishoolred position. To this end the upper portion 45 'of' thetuyre plate is provided-with a downwardly extending projection or flange50 which is located on both sides of the web 32,v as'illu'strated, andthis flange 50-slips into position between the upstanding lugs 48 Vandthe plate 15. In order to prevent movement of the lowerend of the tuyreplate toward the retort, the web 32 extends downwardly to form "l aprojection 53 which is inserted thru the opening 24 in the bottom of thelate 19. It

will therefore be seen that I have provided int'erlitting locatingmembers on the tuyre plates and the support which hold the tuyre platesin position and. prevent mov-ement thereof in'eve'ry direction exceptupwardly, and that each tuyre plate can be removed only by lifting itvertically from its operative position.

In order to fasten these parts in place and prevent their removal exceptas desired, I can utilize various types of construction but in thepreferred embodiment I provide a' rod 55 and a hook bolt 56, which maybe secured together if desired. .This rod 55 rests on the bottoms 58 ofthe slot-s 59 in the webs 32. Each slot 59 is of greater size verticallythan the thickness of the rod 55 so that the rod 55 vmay be raised bylifting any one plate withlthe plateV high enough vto clear the flange50, vand then the tuyre plate may be tipped toward the retort to movethe shoulder 53 out from under the rod 55 and thus permit the tuyreplate to be lifted a further suiiicient distance to withdraw the lug 53fromthe opening 24. The hook bolts 56 are bolted down to a flange 60 onthe side bar and are fastened thereto by means of nuts 61 on the lowerends Vof the bolts. Before any onel of the tuyre plates may be removedit will be understood that the nut 61 should be removed or loosened soas to permit upward motion of the hook bolt 56 and the rod 55. The rod55 is prevented from being moved endwise by the side plates 26 of thesupport 16 andthe rod is thereby permanently located in posi- ,Y

tion in the assembled group of tuyere plates. Ihe ribs 25, 1t will beobserved, contact with the rod 55 and prevent it from being moved outofthe slot 59.

The end tuyre blocks are shown as boX- lile structures made as hollowcastings. The

lower block 64 has ribs 65 on its outer face and perforations 66 for thepassage of air. This hollow casting is fastened to the two lower tuyreplates by bolts67. The. casting `has wallsy all around and receives aironly lfrom a cored hol'ef68 in the wall adjacent to the tueyre plate.The upper end section is shown as lmade up lofthree hollow 'castingsope'n. at-their bottoms.V The castings 70 and 71 are provided with aribbed structure similar to that of the plates 30, and they are fasteneddown' in like manner by a hook bolt 7 3. These castings are boltedtogether by bolts 74; .The end casting 76 is a simple hollow structurebolted in place as illustrated. It willbe understodthat other forms ofend structure may be employed with the tuyere plates. In the form shown,a blank 78 is employed at the lower end of the retort in place of thecorrugated bar 35, to cut down the air supply at this point. It will beunderstood that lsuch blanks maybe used in other locations as well.

lf one of the tuyere plates 30 requires replacement, it is merelynecessary to loosen or remove the nut 6l from the hook bolt 56 in thatparticular group, and then lift the tuyere plate vertically until theflange 50 will clear the lugs 48. The tuyre plate can then be tiltedaway from the furnace side wall until the shoulder 58 moves from underthe rod 55, thus permitting removal of the plate. In inserting a newtuyre plate, the projection 53 is first placed in the opening 24. Therod 55 is then raised slightly by lifting an adljacent plate, and thenew plate may then be tipped back towards the side wall of the furnaceand dropped into place. r)The nut 6l may then be tightened, holding thetuyere plates of the group firmly in position. ln order to replacethecorrugated plate 35, it is merely necessary to remove the plates 30of the group located above plate 35. All of the parts are lockedtogether when the bolts are tightened, so that the tuyere constructionis rigid during use.

Having thus describet my invention, what l claim as new and desire tosecure by Letters Patent is:

1. A side wall structure for an underfeed etort comprising a support, aset of narrow substantially vertical tuy`ere plates mounted on saidsupport, each plate having a locking shoulder thereon, a fasteningdevice including a rod releasably engaging the shoulders of a group oftuyre plates, and means including an adjustable member which is readilyaccessible from beneath said support for holding the rod against saidshoulders and securing the plates to the support, said member beingmovable to release the rod so that any plate in the group may be removedindependently of the others.

2. A furnace tuyere structure comprising a support, a group ofsubstantially ver ical air admitting tuyre plates mounted thereon,interiitting locating members on sail plates and said support which holdthe tuyre plates in position and prevent movement thereof in everydirection except upwardly, each plate having a locking shoulder, a rodfor the group, contacting withthe shoulders of the plates, and a memberengagingtherod and 'secured to the bottom of the support, said memberholding the rod against the locking shoulders and beingreleasable toallow upward movement of the rod and individual removal of any plate inthe group.

tuyere'plates in position and prevent movement thereof in everydirection except upwardly, a series of substantially horizontal rodseach contacting with the shoulders of a group of tuyere plates, andmeans for fastening each rod independently to the support so that therod may be released and moved upwardly and thus allow a plate in onegroup to be removed without loosening or disturbing a plate in anothergroup.

1l. An underfeed stolzer comprising a retort side wall, a tuyere platesupport mounted thereon, a series of air admitting tuyre plates mountedon said support and each having al fuel `supporting flange and avertical web provided with a shoulder, a series of substantiallyhorizontal rods arranged so that each contacts with the shoulders of agroup of tuyre plates, and a bolt for each group of tuyre platesfastened at its upper end to one of said rods and at its lower end tosaid retort side wall.

5. A high side wall tuyre plate for an underfeed Stoker comprising arelatively thin vertical web, a steeply sloping flange arranged alongone edge of the web and eX- tending beyond each lateral face thereofwhich is adapted to contact with the fuel bed, and a rib arranged oneach side of the web substantially parallel to the flange and spacedtherefrom, said flange and ribs being provided with spaced notches toform air openings between adjacent blocks.

6. An air admitting plate for an underfeed stolrer comprising a thinhorizontal web, a pair of parallel ribs on the upper surface of the web,and a similar pair of parallel ribs on the lower surface of the web,each of said ribs having notches therein adapted to admit air to thefuel bed.

7. An air admitting plate for an underfeed stoker comprising a thinhorizontal web, a pair of parallel ribs on the upper surface of the web,and a similar pair of parallel ibs on the lower surface of the web, eachof saidv ribs having'notches therein adapted to admit air to the fuelbed, and the notches inthe lower ribsA being staggered with respeet tothe notches in the upper ribs.

8. An air admitting plate for an underfeed Stoker comprising a thinhorizontal web, a pair of parallel ribs on the upper surface of the web,and a similar pair of parallel ribs on the lower surface of the web,each of said ribs having notches therein arranged at an angle to theribs to direct air into the fuel bed.

9. A high side wall tuyre plate for an underfeed stoler adapted to bearranged parallel with similar plates above the retort wall and admitair to the fuel comprising a relatively thin vertical web having asteeply sloping' flange along that edge which will contact with the fuelbed and a rib projecting laterally from the web which is spaced from andis substantially coextensive With and parallel to the flange, both theflange and the rib providing air admitting passages, and the rib servingas a fuel support after the flange has burned away.

l0. A furnace tuyre structure comprising a support having a Wall and abottom provided With an opening therethrough, a separate tuyre platedisposed on the bottom on the opposite side of said opening from theWall, and a series of tuyre plates mounted side by side above saidbottom tuyre plate which are supported on the top of the Wall and restupon the bottom tuyre plate in positions substantially perpendicularthereto, said parts forming a hollow structure adapted to support fuelagainst the tuyre plates and admit air thereto.

Signed at Worcester, Mass, this 23rd day of July, 1927. Y

CARL H. RICH.

